Same here, but a potential problem we ran into is that some people apparently just do not leave voicemails and do not realize how many people do not as a rule answer calls from unknown numbers.
In our case, someone from the office of the anesthesiologist we had never spoken with but who was scheduled to assist with my wife's surgery called my wife from a number other than the surgeon's office number, and of course my wife did not answer. The caller wanted to contact her to let her know the surgery she was scheduled for in two days was going to be canceled, due to something they saw in her health record (at essentially the last minute). They called several times that day but never left a voice message, perhaps due to confidentiality concerns--we never did find out the reason. It was incomprehensible to us that they did not leave a simple message saying they were from so-and-so's office and to please call them back immediately. The surgeon's office called the next day--the day before the scheduled surgery--to let us know of the cancelation. That was the only phone number my wife had, and she was expecting a call confirming the surgery was on, so of course she had the phone handy and answered it.
Off the topic and just complaining now, but would you believe that the person who called from the surgeon's office to tell my wife the surgery was canceled did not have information as to the reason for the cancelation? My wife had to contact the surgeon directly to find out, and it was then that she connected the dots and realized that the multiple calls from the unknown number were from the anesthesiologist's office.